How to keep list changes when program ends?

I have made simple Submit score option. User inputs name and score, and they are save to the list. List saves only top 10 scores. Than, list is printed to .txt file. But it works only while program is working. When i start it again, there's only default score in .txt file. User scores weren't saved. I'm using pickle module for that.

This is piece of my code. It's Python 3.4 and Tkinter.
Keep on mind that I'm learning python.